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Which equals operator (== vs ===) is faster?
(version: 0)
Is there a performance benefit to replacing == with ===?
Comparing performance of:
test equality vs test strict equality
Created:
9 years ago
by:
Guest
Go to the latest result
Tests:
test equality
var n = 0; if (n == 0) { // same type } if (n == '0') { // different type } if (n == {}) { // totally different }
test strict equality
var n = 0; if (n === 0) { // same type } if (n === '0') { // different type } if (n === {}) { // totally different }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
test equality
test strict equality
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Browser/OS:
Chrome 137 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=611321" width="100%" height="500px"></iframe>
test strict equality
83.5M/s
test equality
9.2M/s
View exact numbers
Test name
Executions per second
✓
test strict equality
83,485,472 Ops/sec
test equality
9,151,661 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested, compared, and other considerations. **Benchmark Overview** The benchmark compares the performance of using loose equality operators (`==`) versus strict equality operators (`===`) in JavaScript. The test cases check the execution time of simple if statements with different types of values (same type, different type, and totally different). **Test Cases** There are two test cases: 1. **test equality**: This test case checks the performance of using loose equality operators (`==`) for comparing a number (`n = 0`) with strings ('0') and objects ({}) that have the same value as the number. 2. **test strict equality**: This test case checks the performance of using strict equality operators (`===`) for comparing a number (`n = 0`) with strings ('0') and objects ({}) that have the same value as the number. **Comparison** The benchmark compares the execution time of both approaches (loose vs strict equality) in each test case. The results are stored in two separate test runs, which allows for comparison between the two approaches. **Pros and Cons** 1. **Loose Equality (`==`)**: * Pros: Fast, easy to use, and compatible with older browsers. * Cons: Can lead to unexpected behavior due to type coercion, and may cause security vulnerabilities (e.g., comparing a number with a string). 2. **Strict Equality (`===`)**: * Pros: More accurate, secure, and less prone to type coercion issues. * Cons: Slightly slower than loose equality operators. **Library and Special Features** There are no libraries used in this benchmark. However, the test cases utilize special features of JavaScript: 1. **Type Coercion**: The `==` operator performs type coercion, which can lead to unexpected behavior when comparing values with different types. 2. **Strict Equality (`===`) Operator**: Introduced in ECMAScript 2009, the strict equality operator provides more accurate and secure comparisons. **Other Considerations** 1. **Browser and Platform Variability**: The benchmark results are affected by various browser and platform factors, such as device hardware, operating system, and version. 2. **Performance Optimization**: In real-world scenarios, performance optimization techniques (e.g., caching, memoization) might be used to improve the execution time of equality checks. **Alternatives** If you're interested in exploring alternative approaches or libraries for benchmarking JavaScript performance, consider the following: 1. **Benchmark.js**: A popular JavaScript benchmarking library that provides a simple and flexible API for creating benchmarks. 2. **Benchpress**: Another popular JavaScript benchmarking library that allows for more advanced customization and control over benchmarking scenarios. 3. **V8's Benchmark Suite**: A set of benchmarking tests provided by the V8 engine, which can be used to measure the performance of specific JavaScript features or libraries. Keep in mind that these alternatives might have different use cases, syntax, and requirements compared to MeasureThat.net.
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